2.
Troubleshoot the
A50 DC-DC
Converter
Figure
7-9.
A50
DC-DC
Conv
erter
Troubleshooting
Setup
a.
T
urn
the
analyzer
p
o
w
er
o.
b.
Disconnect
cables from
the A50J3.
The connector
lo
cations
are
sho
wn
in
Figure
7-9
c.
Connect
the
pulse
generator
to
the
A50J2
as
shown
in Figure
7-9.
The
pulse
generator
is
used
to
feed
the
substitute
of
the
F
AN
LOCK
signal
to
the
A50
DC-DC
con
verter.
This
purposes
not to
shut
do
wn
the
A50
DC-DC
con
v
erter.
d.
T
urn the
pulse
generator
p
o
w
er
on.
Set
the
con
trols
as follo
ws:
WaveF
orm Square
Frequency Approximately 30 Hz
Amplitude +7.8 V
e. Connect a resister (app o
ximately 680ohms, 125mW) bet
ween the
A50J2 pin 5 (+7.8 V)
and pin 4(GND) as
shown in Figure 7-9.
f. T
urn
the analyzer p o
wer on.
g. Measure all p ower supply voltages on A50J2 and A50J3 using a voltmeter with a small
probe. See the Table 7-1 for p ower lines, connector pins, and limits.
Power Supply Troubleshooting 7-13
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